include [HTML_REMOVED]
include [HTML_REMOVED]
include [HTML_REMOVED]
using namespace std;
const int N = 510;//数据范围500
int n;
int w[N][N], f[N][N]; // w用来存输入的数据,f用来计算结果
int main(){
cin >> n;
for(int i = 1; i <= n; i){
for(int j = 1; j <= i; j){
cin >> w[i][j];
}
}
//输入数据
for(int i = 1; i <= n; i++){
f[n][i] = w[n][i];
}
//初始化边界
for(int i = n-1; i > 0; i–){ //此处i > 0可省略写为; for(int i = n-1; i > 0; i–)
for(int j = 1; j <= i; j++){
f[i][j] = max(f[i + 1][j], f[i + 1][j + 1]) + w[i][j];
}
}
//状态计算
cout << f[1][1] << endl;
}